Question

Grass grows over the fuelds

Answer 1

The passive voice of the sentence "Grass grows over the field" can be written as "Grass is grown over the field". 1) The main point to be noted here is that, the verb in the sentence "grows" is used as an intransitive form. 2) But, the passive form can be written with similar sense, "Grass is grown over the field".

Answer 2

Grass does grow all over the field because of the countinous dispersal of news grass to grow in the form of seeds